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Patients with lesions in V1 or striate were found to still be able to discriminate gender and expression of faces. ⇒

The receptive field properties of neurons in the cat striate cortex have been modeled as linear filters. In particular three types of linear filters have been proposed:

- Gabor filters,
- filters that based on second differentials of Gaussians functions,
- difference of Gaussians filters.⇒

Hawken and Parker studied the response patterns of a large number of cells in the cat striate cortex and found that Gabor filters, filters which are second differential of Gaussian functions, and difference-of-Gaussians filters all model these response patterns well, quantitatively.

They found, however, that difference-of-Gaussians filters strongly outperformed the other models.⇒

Difference-of-Gaussians filters are parsimonious candidates for modeling the receptive fields of striate cortex cells, because the kind of differences of Gaussians used in striate cortex (differences of Gaussians with different peak locations) can themselves be computed linearly from differences of Gaussians which model receptive fields of LGN cells (where the peaks coincide), which provide the input to the striate cortex.⇒